PROJECT CASE
CASE STUDY
STUDY
Gabion mattress deployment at former
manufactured gas plant site
The sediment cap project is situated on a former manufactured gas plant (MGP) site located
adjacent to the Boston Harbor. Previous remedial work included dredge and disposal in CAD
cell and cap. Persistent sheen resulting from gas ebullition was apparent.
In the top left image, mattress sections are filled with stone (stone size varies) and the geogrid is seamed shut. In the top right image,
Reactive Core Mat® is attached to the bottom of the mattress. The Reactive Core Mat® is filled with Organoclay®, which is used to
adsorb contaminants. The mattress system’s subaqueous installation is aided by divers to ensure proper positioning of the mattress sections.
PROJECT DETAILS
Island End River Sediment Cap
Design Engineer: Arcadis
General Contractor: Sevenson
Environmental Services
General Contractor: Maxymillian
Technologies, Inc.
LOCATION
Boston, Massachusetts, U.S.A
PRODUCTS USED
Organoclay® Reactive Core
Mat®
Triton® Marine Mattresses
www.cetco.com
CHALLENGE:
Treating contaminated sediments in a subaqueous environment presents
a set of unique challenge. In these types of applications, a mechanism
is needed to aid in placement of the underlying geotextile treatment layer
with minimal displacement of sediment. For this application, the underlying geotextile was Reactive Core Mat®, which is designed to sequester
and treat contaminants within the soil.
SOLUTION:
The remediation strategy included the placement of a modular reactive
capping system, including Triton® Marine Mattresses used in conjunction with 135,000 lbs. of Organoclay® bulk capping material and 35,000
square feet of Reactive Core Mat®, in order to prevent non-aqueous
phase liquid (NAPL) contamination from reaching the surface waters. The
modified mattress system utilizes Organoclay® filled within the Reactive
Core Mat® to adsorb contaminants.
Continued on back >
PROJECT CASE
CASE STUDY
STUDY
- Continued from front
Gabion mattress deployment at
former manufactured gas plant site
SOLUTION (con’t.):
With the help of underwater divers, the Triton® Marine Mattresses and
Reactive Core Mat® sediment treatment layer was installed with ease
and is performing as expected. The system allowed for minimal displacement of sediments and eliminated the need for a thick sand cap.
RESULT:
The 600 Triton® Marine Mattresses performed as expected, and the
revetment and underlying 25,000 square feet of Reactive Core Mat®
sediment treatment layer remained intact, with no damage.
OUR STANDARDS. YOUR PEACE OF MIND.
www.CETCO.com
North America: 847.851.1800 | 800.527.9948 | South America: +56.2.757.1750
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